third_party/WebKit/Source/platform/fonts/FontPlatformData.h

/*
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 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 */

#ifndef FontPlatformData_h
#define FontPlatformData_h

#include "SkPaint.h"
#include "SkTypeface.h"
#include "platform/PlatformExport.h"
#include "platform/SharedBuffer.h"
#include "platform/fonts/FontDescription.h"
#include "platform/fonts/FontOrientation.h"
#include "platform/fonts/FontRenderStyle.h"
#include "platform/fonts/SmallCapsIterator.h"
#include "platform/fonts/opentype/OpenTypeVerticalData.h"
#include "wtf/Allocator.h"
#include "wtf/Forward.h"
#include "wtf/HashTableDeletedValueType.h"
#include "wtf/RefPtr.h"
#include "wtf/text/CString.h"
#include "wtf/text/StringImpl.h"

#if OS(MACOSX)
OBJC_CLASS NSFont;

typedef struct CGFont* CGFontRef;
typedef const struct __CTFont* CTFontRef;

#include <objc/objc-auto.h>

inline CTFontRef toCTFontRef(NSFont *nsFont) { return reinterpret_cast<CTFontRef>(nsFont); }
inline NSFont* toNSFont(CTFontRef ctFontRef) { return const_cast<NSFont*>(reinterpret_cast<const NSFont*>(ctFontRef)); }
#endif // OS(MACOSX)

class SkTypeface;
typedef uint32_t SkFontID;

namespace blink {

class Font;
class GraphicsContext;
class HarfBuzzFace;

class PLATFORM_EXPORT FontPlatformData {
    USING_FAST_MALLOC(FontPlatformData);
public:
    // Used for deleted values in the font cache's hash tables. The hash table
    // will create us with this structure, and it will compare other values
    // to this "Deleted" one. It expects the Deleted one to be differentiable
    // from the 0 one (created with the empty constructor), so we can't just
    // set everything to 0.
    FontPlatformData(WTF::HashTableDeletedValueType);
    FontPlatformData();
    FontPlatformData(const FontPlatformData&);
    FontPlatformData(float size, bool syntheticBold, bool syntheticItalic, FontOrientation = FontOrientation::Horizontal);
    FontPlatformData(const FontPlatformData& src, float textSize);
#if OS(MACOSX)
    FontPlatformData(NSFont*, float size, bool syntheticBold = false, bool syntheticItalic = false, FontOrientation = FontOrientation::Horizontal);
#endif
    FontPlatformData(PassRefPtr<SkTypeface>, const char* name, float textSize, bool syntheticBold, bool syntheticItalic, FontOrientation = FontOrientation::Horizontal);
    ~FontPlatformData();

#if OS(MACOSX)
    CTFontRef ctFont() const;
    CGFontRef cgFont() const;
#endif

    String fontFamilyName() const;
    float size() const { return m_textSize; }
    bool syntheticBold() const { return m_syntheticBold; }
    bool syntheticItalic() const { return m_syntheticItalic; }

    SkTypeface* typeface() const;
    HarfBuzzFace* harfBuzzFace() const;
    bool hasSpaceInLigaturesOrKerning(TypesettingFeatures) const;
    SkFontID uniqueID() const;
    unsigned hash() const;

    FontOrientation orientation() const { return m_orientation; }
    bool isVerticalAnyUpright() const { return blink::isVerticalAnyUpright(m_orientation); }
    void setOrientation(FontOrientation orientation) { m_orientation = orientation; }
    void setSyntheticBold(bool syntheticBold) { m_syntheticBold = syntheticBold; }
    void setSyntheticItalic(bool syntheticItalic) { m_syntheticItalic = syntheticItalic; }
    bool operator==(const FontPlatformData&) const;
    const FontPlatformData& operator=(const FontPlatformData&);

    bool isHashTableDeletedValue() const { return m_isHashTableDeletedValue; }
#if OS(WIN)
    void setMinSizeForAntiAlias(unsigned size) { m_minSizeForAntiAlias = size; }
    unsigned minSizeForAntiAlias() const { return m_minSizeForAntiAlias; }
    void setMinSizeForSubpixel(float size) { m_minSizeForSubpixel = size; }
    float minSizeForSubpixel() const { return m_minSizeForSubpixel; }
    void setHinting(SkPaint::Hinting style)
    {
        m_style.useAutoHint = 0;
        m_style.hintStyle = style;
    }
#endif
    bool fontContainsCharacter(UChar32 character);

    PassRefPtr<OpenTypeVerticalData> verticalData() const;
    PassRefPtr<SharedBuffer> openTypeTable(SkFontTableTag) const;

#if !OS(MACOSX)
    // The returned styles are all actual styles without FontRenderStyle::NoPreference.
    const FontRenderStyle& getFontRenderStyle() const { return m_style; }
#endif
    void setupPaint(SkPaint*, float deviceScaleFactor = 1, const Font* = 0) const;

#if OS(WIN)
    int paintTextFlags() const { return m_paintTextFlags; }
#else
    static void setHinting(SkPaint::Hinting);
    static void setAutoHint(bool);
    static void setUseBitmaps(bool);
    static void setAntiAlias(bool);
    static void setSubpixelRendering(bool);
#endif

private:
#if !OS(MACOSX)
    void querySystemForRenderStyle();
#endif

    RefPtr<SkTypeface> m_typeface;
#if !OS(WIN)
    CString m_family;
#endif

public:
    float m_textSize;
    bool m_syntheticBold;
    bool m_syntheticItalic;
    FontOrientation m_orientation;
private:
#if !OS(MACOSX)
    FontRenderStyle m_style;
#endif

    mutable RefPtr<HarfBuzzFace> m_harfBuzzFace;
    bool m_isHashTableDeletedValue;
#if OS(WIN)
    int m_paintTextFlags;
    unsigned m_minSizeForAntiAlias;
    float m_minSizeForSubpixel;
#endif
};

} // namespace blink

#endif // ifdef FontPlatformData_h